# Structural, magnetostatic and magnetodynamic studies of Co/Mo-based uncompensated synthetic antiferromagnets

## TL;DR

This study investigates the structural, magnetic, and dynamic properties of epitaxial Co/Mo superlattices, revealing how spacer thickness influences antiferromagnetic coupling and magnetic anisotropy, with theoretical models accurately matching experimental data.

## Contribution

It provides a comprehensive analysis of Co/Mo superlattices, combining experimental characterization with theoretical modeling to understand interlayer exchange coupling and anisotropy.

## Key findings

- Magnetization couples antiferromagnetically depending on Mo spacer thickness.
- Hysteresis loops reflect interlayer exchange and uniaxial anisotropy.
- Theoretical models accurately reproduce experimental magnetic behaviors.

## Abstract

In this work, we comprehensively investigate and discuss the structural, magnetostatic, dynamic, and magnetoresistive properties of epitaxial Co/Mo superlattices. The magnetization of the Co sublayers is coupled antiferromagnetically with a strength that depends on the thickness of the nonmagnetic Mo spacer. The magnetization and magnetoresistance hysteresis loops clearly reflect interlayer exchange coupling and the occurrence of uniaxial magnetic anisotropy induced by the strained Co sublayers. Upon accounting for a deviation of the sublayer thicknesses from the nominal value, theoretical modeling, including both micromagnetic and macrospin approaches, precisely reproduces experimental magnetic hysteresis loops, magnetoresistance curves, and ferromagnetic resonance dispersion relations. The Mo spacer thickness as a function of the interlayer magnetic coupling is determined as a fitting parameter by modeling the experimental results.